At the very end of his purpose statement, John says what believing is for: “that by believing you may have life in his name.” The word for “name” is ὄνομα (onoma) — and in the Hebrew and Jewish way of speaking, a person’s name was never just a label. It stood for the whole person: their identity, their character, their authority, their presence. To know someone’s name was to know who they were; to act in someone’s name was to act with their authority; to have something in their name was to have it through who they are.

This is an idiom worth pausing on, because English flattens it. We treat a name as a tag, a string of letters that points at a person but isn’t the person. The Hebrew sensibility runs the other way. The name is the person, gathered into a word. So when John writes that you may have life “in his name,” he isn’t pointing you at a label to invoke. He’s pointing you at Jesus himself — at the whole of who he is.

That changes how the verse’s closing phrase lands. The goal John names isn’t a transaction, a benefit dispensed when the right name is spoken. It’s a belonging. To have life “in his name” is to have it in and through who Jesus is — folded into his identity, sharing in his presence and his authority. The life comes not from saying a word but from being bound to the person the word names.

And notice what the life is. The word John pairs with onoma here is zōē — the deepest of the Greek words for life, the animating vitality he opened his whole Gospel with: “In him was life, and that life was the light of all mankind.” The same word closes his purpose statement. John began by telling you the Word held life, and he ends by telling you that’s exactly what he wants you to have — and that you have it in his name, in and through who Jesus is.

So when you meet onoma in “life in his name,” hear the whole person standing inside the word. Not a label, not a formula — the identity, character, authority, and presence of the one being named. To have life in his name is to have the Gospel’s deepest kind of life by belonging to him. The name is the person; the life is found in him.